richmond



(No Model.)

0. M. RICHMOND.

DENTAL DRILL.

Patented Apr. 4,1882.-

WITNESSES ATTORNEYS.

UNITED STATES PATENT Orrrcst ()ASSlUS M. RICHMOND, OF NEW YORK, N. Y.

DENTAL DRILL.

SPECIFICATION forming part of Letters Patent No. 256,050, dated April 4, 1882.

Application filed September 15, 1881.

To all whom it may concern:

Be it known that I, CASSIUS M. RICHMOND, ofthe city, county, and State ofNew York, have invented a new and useful Improvementin Tools and Tool Holders, of which the following is a full, clear, and exact description.

Reference is to be hadto the accompanying drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l isa side elevation of my improvement, shown as provided with a hand piece and with the tool disconnected. Fig. 2 is asectional side elevation of the same as arranged for use. Fig. 3 is a sectional plan view of the same, taken through the line awa'Fig. 2. Fig. 4 is a side elevation of apart of the same, showing the spring-catch enlarged. Fig. 5 is a sectional plan view taken through the line y 2 Fig. 4.

The object of this invention is to provide tools and tool-holders constructed in such a manner that the tools can be readily attached and detached and will be securely held.

The invention consists in the combination, with a slotted hollow rod, of astem havingits forward endhalved or rabbet-ed and a groove across the inner part of the rabbet, a cross-pin, a sliding ring, and a spring-catch, whereby a tool can be readily attached and detached and will be securely held; and also in the combination,with the tool-holding rod and the springcatch, of a hand-piece and an interior ring and its pins, whereby the tool-holding rod can be conveniently handled and the tool readily at tached and detachedfias will be hereinafter fully described.

I will describe my improvement as applied to dental tools, but do not limit myself to that use, as it can be applied with equal advantage to various other kinds of tools.

A is a rod, one endrof which is designed to be connected with the flexible shaft of a dental drill. The other end of the rod A is perforated longitudinally, and in the said pertoration is placed arod or stem, B.

(No model.)

the said rod A. The slots D are made of such a length that the stem B can he slid outward so far that its end will project beyond the end of the rod A, as shown in Fig. 1. The stem B is held in place, when pushed inward, by a spring-catch, F, the shoulder of which engages with the ring E. The end of the spring-catch F is beveled upon the inner side, so that when the stem'B is pushed inward the ring E will rise and pass the said end. The outer end of the stem B is halved, and in the inner part of the rabbet or flat surface Gr thus formed is made a cross-groove, H, as shown in Figs. 1 and 2. t v

I is the tool, the end of the shank of which is halved, and in the inner part of the flat surface or rabbet J thus formed is made a crossgroove, K. The rabbets G and J are made of equal length, and the grooves H K are of a width equal to half the length of the rabbets G J, so that the ends of the rod B and tool I will interlock with each other and leave their outer surfaces flush and smooth. With this construction, when the tool I and stem B have said rear end inward.

WVhen the invention is applied to a dental drill the rod A is provided with a haud-piece, within which it revolves freely, and which is formed of a tubular center piece or body, L,

and end pieces, M N. The rear end piece, M,

is perforated to receive and fit upon the rod A,

N is kept from forward movement upon the rod A by a collar, 0, shrunk 0r driven upon or otherwise secured to the said rod, and

against which the inner end of the end piece M rests. The hand-piece L M N is kept from rearward movement upon the rod A by ashoulder, 1?, formed upon the said rod, and against which the inner end of the end piece N rests.

Q is a ring placed within the tube L and connected with it by two pins, R, attached to the said ring and projecting through short longitudinal slots in the opposite sides of the said tube L. The pins Roan have knobs attached to their outer ends for convenience in operating them. The ring Q surrounds the red A and the pivoted part of the spring-catch F, so that when the said ring Q is drawn to the rearward by means of the pins B it will press the raised rear end of the said spring-catch F inward,and thus release the ring E and Ihe stem B and allow the tool I to be detached.

Having thus described my invention, I claim as new and desiieto secure by Letters Patent- 1. The combination, with the slotted hollow rod A, of the stem B, having its forward end halved or rabbeted and a groove across the inner part of the rabbet, the pin G, the ring E, and the spring-catch F, substantially as herein shown and described, whereby a tool can be readily attached and detached and will be securely held, as set forth.

2. The combination, with the tool holding rod A and the springcatch F, of the handpiece L M N. the interior ring, Q, and the pins B, suhstantiull as herein shown and described,

whereby the tool holding rod can be conveniently handled and the tool readily attached and detached, as set forth.

OASSIUS M. RICHMOND.

VVitnesses:

W. W. SHEFFlELD, B. W. LEONARD. 

